EP3794934A1 - Détection de déficience en nutriments dans des plantes - Google Patents

Détection de déficience en nutriments dans des plantes Download PDF

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Publication number
EP3794934A1
EP3794934A1 EP19198091.1A EP19198091A EP3794934A1 EP 3794934 A1 EP3794934 A1 EP 3794934A1 EP 19198091 A EP19198091 A EP 19198091A EP 3794934 A1 EP3794934 A1 EP 3794934A1
Authority
EP
European Patent Office
Prior art keywords
leaf
casing
imaging device
image
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19198091.1A
Other languages
German (de)
English (en)
Inventor
Navin Twarakavi
Alexander Toporov
Taewon Yeon
Syed Mehtab
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yara International ASA
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Yara International ASA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yara International ASA filed Critical Yara International ASA
Priority to EP19198091.1A priority Critical patent/EP3794934A1/fr
Priority to PCT/EP2020/076025 priority patent/WO2021053098A1/fr
Priority to AU2020349600A priority patent/AU2020349600A1/en
Priority to CN202080065629.8A priority patent/CN114391094A/zh
Priority to CA3153992A priority patent/CA3153992A1/fr
Priority to BR112022003480A priority patent/BR112022003480A2/pt
Priority to EP20771330.6A priority patent/EP4030889B1/fr
Publication of EP3794934A1 publication Critical patent/EP3794934A1/fr
Priority to CONC2022/0004397A priority patent/CO2022004397A2/es
Withdrawn legal-status Critical Current

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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control
    • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
    • H04N1/6052—Matching two or more picture signal generators or two or more picture reproducers
    • H04N1/6055—Matching two or more picture signal generators or two or more picture reproducers using test pattern analysis
    • A—HUMAN NECESSITIES
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    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
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    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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    • G01J3/02—Details
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    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
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    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/93—Detection standards; Calibrating baseline adjustment, drift correction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/56—Accessories
    • G03B17/561—Support related camera accessories
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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    • G—PHYSICS
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    • G06V10/75—Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video features; Coarse-fine approaches, e.g. multi-scale approaches; using context analysis; Selection of dictionaries
    • G06V10/751—Comparing pixel values or logical combinations thereof, or feature values having positional relevance, e.g. template matching
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G7/00—Botany in general
    • A01G7/06—Treatment of growing trees or plants, e.g. for preventing decay of wood, for tingeing flowers or wood, for prolonging the life of plants
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8466—Investigation of vegetal material, e.g. leaves, plants, fruits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V20/00—Scenes; Scene-specific elements
    • G06V20/60—Type of objects
    • G06V20/68—Food, e.g. fruit or vegetables

Definitions

  • the present invention generally relates to the detection of nutrient deficiencies in plants.
  • Nutrient deficiency in plants can slow down growth or lead to stresses which ultimately leads to reduced yield and economic loss to farmers.
  • Examples of nutrients required by plants are macronutrients, secondary nutrients and micronutrients, the macronutrients being consumed in larger quantities by the plants than the micronutrients.
  • Examples of important macronutrients and micronutrients that are important for plant growth include nitrogen and iron, respectively.
  • An objective of the present invention is to provide an improved or alternative solution for detecting nutrient deficiencies in plants.
  • a casing for use in a system for estimating a deficiency of a nutrient in a leaf from a plant
  • the casing comprises an upper cover adapted to receive an imaging device including a camera and a light source
  • the upper cover comprises at least one opening to allow the camera and light source to access an interior of the casing
  • a bottom plate having a surface facing the interior of the casing, which surface is provided with a pattern including areas having a predefined color
  • a side wall wherein the upper cover, the bottom plate, and the side wall together define a space constituting an interior of the casing, wherein, in use, a leaf is placed on the surface and an image is acquired of the leaf, whereby the areas allow color calibration of an acquired image.
  • the casing helps to create a dark space around the leaf, which helps to increase the quality of the images of the leaf acquired by the imaging device.
  • the walls of the casing including the top and bottom surfaces, may be a light-blocking (non-transmissive) material so that it prevents natural light to enter the casing and influence the measurement.
  • the casing can be particularly convenient to carry and easy to operate, thereby facilitating the work of agronomists and others who visit different sites where plants grow in order to perform nutrient deficiency estimates.
  • the casing can be manufactured in a cost-effective manner using low-cost materials and simple manufacturing techniques.
  • the dark space of the casing helps to acquire images with consistent color reproduction, thus enabling color analysis of the images.
  • sources of color variation e.g. variation in spectral distribution of light from the light source (flash) and variations in color sensitivity in the image sensor of the camera.
  • light sources of different devices e.g. different mobile phones
  • the emitted light may still be different with respect to intensity, color temperature, etc.
  • the pattern according to the present invention is used for color calibration of the acquired image.
  • the pattern includes areas of a known color (e.g. white), so that pixels in the acquired image relating to such areas of known color may be used as a color reference. This enables the device to calibrate (correct) the color of the entire acquired image, including the leaf, so as to make it useful for analysis.
  • a known color e.g. white
  • the pattern may be black-and-white, such as white dots on a black background.
  • the bottom plate may be removable.
  • the upper cover may be hingedly connected to one of said side walls.
  • the entire casing is foldable into a substantially flat state. In its flat state, the casing may be more convenient to store and carry.
  • the pattern is a repetitive (periodic) pattern, so as to enable detection of a size and/or shape of the leaf in the acquired image. By detecting which white dots that are visible (i.e. not obscured by the leaf) the size and shape can be approximated.
  • the upper cover may be recessed to accommodate the imaging device, and the casing may further comprise means for temporarily securing the imaging device on the upper lid.
  • a system for estimating a deficiency of a nutrient in a leaf from a plant comprising: a casing according to the first aspect of the present invention; an imaging device, and a processing unit, configured to color calibrate an acquired image, and estimate the deficiency based on an image of the leaf acquired by the imaging device when the leaf is placed inside the casing on the surface of the bottom plate.
  • the imaging device may for example be a portable imaging device, such as a mobile phone, incorporating also the processing unit.
  • the second aspect of the present invention may exhibit the same or similar features and technical effects as the first aspect, and vice versa.
  • the processing unit may be configured to estimate the deficiency based on the image of the leaf by analyzing the imaged leaf along at least two straight lines, wherein each straight line extends in the width direction of the leaf and/or joins two points located on the leaf's margin.
  • the inventors of the present invention have realized that nutrient deficiencies in plants can be detected by analyzing a relatively small set of data that can be obtained from analyzing judiciously-chosen lines in an image of the leaf.
  • the number of lines depend on the various factors, such as the size and shape of the leaf. The larger the leaf, the more lines are typically defined. At least two lines are usually required to obtain the information needed to reliably estimate whether or not the leaf suffers from a nutrient deficiency and, if so, the type of deficiency.
  • Analyzing of the imaged leaf along at least two straight lines by the processing device may include: determining a length of each straight line to determine the age of the leaf; gauging the color of the imaged leaf along each straight line; and assessing at least one leaf component along each straight line, and the processing device may be configured to estimate the deficiency based on the determined age, the gauged color, and the assessed at least one leaf component.
  • Assessing at least one "leaf component” may for example comprise determining the number of leaf veins which cross the lines and/or determining the sizes of regions between leaf veins. The size of such regions may give an indication of the amount of chlorophyll in the leaf, large regions being associated with large amounts of chlorophyll.
  • Any deficiency may be estimated e.g. by comparing images of the leaf with images in a reference library.
  • a trained machine learning model may be used. Using a machine learning model may help to improve the quality of the estimates.
  • a device for use with a casing according to the first aspect comprising a camera, a light source, and a processing unit configured to perform color calibration of an image acquired by the camera of a leaf placed on a surface of a bottom plate of a casing according to the first aspect.
  • the processing device may be configured to estimate the deficiency based on the image of the leaf by analyzing the imaged leaf along at least two straight lines, wherein each straight line extends in the width direction of the leaf and/or joins two points located on the leaf's margin.
  • a method of determining a deficiency of a nutrient in a leaf comprises placing the leaf on the surface provided with the black-and-white pattern of the bottom plate of the casing according to the first aspect of the present invention, positioning an imaging device on the upper cover of the casing, acquiring an image of the leaf by the imaging device when the leaf is placed inside the casing on the surface of the bottom plate, using the pattern to color calibrate the acquired image; and estimating said deficiency by processing the color calibrated image.
  • the processing may include analyzing the imaged leaf along at least two straight lines, wherein each straight line extends in the width direction of the leaf and/or joins two points located on the leaf's margin.
  • the method may further include: determining a length of each straight line to determine the age of the leaf; gauging the color of the imaged leaf along each straight line; and assessing at least one leaf component along each straight line, wherein the method further comprises: estimating the deficiency based on the determined age, the gauged color, and the assessed at least one leaf component.
  • the method according to the fourth aspect of the present invention may further comprise determining a fertilization for the plant based on the estimated deficiency.
  • the method makes it possible to recommend a fertilization for the plant a particularly simple and fast manner. For example, if it is determined that the plant lacks iron, then the recommendation may be to give the plant a certain amount of iron or simply to give the plant more iron.
  • Figure 1 shows a system 1 for estimating a deficiency of a nutrient in a leaf 100 which has been removed from a plant.
  • the leaf 100 may alternatively be referred to as a plant leaf.
  • the system 1 comprises an imaging device 2 comprising a camera 3 and a light source (flash) 4.
  • the imaging device 2 is here a conventional mobile phone with an integrated camera and flash.
  • the camera 3 and the flash 4 are located next to each other on the side of the imaging device 2 facing downwards.
  • the imaging device 2 may be of a different type, such as a camera which is not integrated with a mobile phone.
  • the imaging device 2 here also comprises a screen 5.
  • the imaging device 2 is in this case configured for wireless communication with remote devices. Specifically, the imaging device 2 is in this case capable of sending and receiving Wi-Fi signals and mobile network signals, such as GSM signals and LTE signals.
  • the system 1 further comprises a casing 6.
  • the casing 6 is in this case a rectangular casing. More specifically, the casing 6 has a side wall 7 and an upper cover 8.
  • the upper cover 8 is adapted to receive the imaging device 2, and is here essentially flat.
  • the side wall 7 has four faces forming a rectangular shape, but the side wall could have been a smooth cylinder, e.g. forming an oval shape.
  • the upper cover 8 is provided with an opening 9 for allowing the camera 3 and flash 4 to view inside the casing 6 when the imaging device 2 is arranged on the upper cover 8.
  • the upper cover 8 is connected to the side wall 7, in this case close to an upper edge of the side wall 7. As can be seen in Figure 1 , the upper cover 8 is in this case recessed.
  • the casing 6 further comprises an optional means 10 for temporarily securing the imaging device 2 on the upper cover 8, here a strap 10.
  • the strap 10 passes from one of the faces of the side wall 7 to another, across the upper cover 8.
  • the strap 10 is in this case made of an elastic material.
  • the casing 6 may also comprise a light diffuser 11 which is arranged to diffuse light emitted by the flash 4 when the imaging device 2 is placed on the upper cover 8.
  • the light diffuser 11 here covers a part of the opening 9.
  • the light diffuser 11 can for example be a thin sheet of paper, plastic or glass. Such a diffuser can be relatively inexpensive to manufacture.
  • the casing 6 further comprises a bottom plate 12.
  • the bottom plate 12 is in this case flat and rectangular, but may have a different shape in a different example.
  • the bottom plate 12, together with the side wall 7 and the upper cover 8, defines a space which constitutes the interior of the casing 6.
  • the bottom plate may be removable, in order to enable access of the interior of the casing.
  • the entire casing is foldable, and the upper cover is hingedly connected to one of the side wall faces.
  • the upper cover 8 may thus be opened in order to access the interior.
  • two of the faces of the side wall 7 can be folded inwards, down towards the bottom plate 12, so that the casing reaches an essentially flat state.
  • the casing 6 may be foldable in a different manner than in the presently described example.
  • the casing 6 should be non-transmissive to light, to ensure that ambient light cannot enter the interior in use.
  • the casing may be made of for example cardboard, a plastic material or a metal, or any other suitable material.
  • the bottom plate 12 has a surface 13 which, during use of the system 1, faces the inside of the casing 6 and on which the leaf 100 is placed.
  • the surface 13 is provided with a pattern including areas of a predefined color.
  • the predefined color is white.
  • the pattern is adapted for calibration with respect to light emitted by the flash 4 and also for measuring the size of the leaf 100.
  • the pattern is black-and-white and comprises a plurality of white dots on a black background.
  • the pattern is preferably repetitive (periodic), with a period preferably in the order of 10 mm or less.
  • the white dots are here arranged in straight rows.
  • the pattern may of course comprise some other type of symbol than circles, such as rectangles or some other polygon, and the symbols may do not have to be arranged in straight rows.
  • the symbols may form a periodic zigzag pattern.
  • the system further comprises a processing device 14 which is configured to estimate nutrient deficiencies in the leaf 100 based on an image thereof acquired by the imaging device 2.
  • the processing device 14 is in this case arranged remotely to the casing 6 and the imaging device 2.
  • the processing device 14 and the imaging device 2 are capable of communicating wirelessly with each other over some type of network, such as a Wi-Fi network, a mobile network, or a combination of different types of networks. Examples of mobile networks which the processing device 14 may be configured to use include GSM networks and LTE networks. It is noted that, in a different example, the processing device 14 may be integrated with the imaging device 2. Alternatively, the processing device may be incorporated in the imaging device. It may, for example, be the processor of a mobile phone.
  • the leaf 100 is placed on the bottom plate 12. Specifically, the leaf 100 is placed on the surface 13 with the black-and-white pattern.
  • step S2 the casing 6 is positioned over the bottom plate 12. Thereby, the leaf 100 is enclosed in a dark space.
  • the imaging device 2 is positioned on the upper cover 8.
  • the imaging device 2 is positioned such that the camera 3 is aligned with the part of the opening 9 where the light diffuser 11 is not located and such that the flash 4 is aligned with the light diffuser 11.
  • the camera 3 has direct line of sight into the casing 6.
  • the imaging device 2 is here positioned below the strap 10, which thereby helps to keep the imaging device 2 in place on the casing 6.
  • the imaging device 2 acquires an image 200 of the leaf 100 placed inside the casing 6 on the surface 13.
  • the image 200 is acquired using the camera 3 and the light source (flash) 4.
  • the pattern on the surface 13 serves to enable color calibration of the acquired image.
  • the (known) color of the white areas (dots) may serve as a reference color, which enables the processing device 14 to calibrate (correct) the color of the leaf in the acquired image.
  • the pattern on the surface 13 further serves to facilitate determination of size and shape of the leaf. Specifically, suitable image processing may detect which dots that are obscured by the leaf, and thereby determine the shape and size of the leaf. This may eliminate the need for more complex and expensive image processing.
  • the acquired image 200 of the leaf 100 is shown in Figure 2 .
  • the imaged leaf is denoted by the reference numeral 100' in Figure 2 .
  • the leaf 100 has a central line 101 extending from a first end 102 of the leaf 100 to a second end 103 of the leaf 100.
  • first end 102 was proximal to the plant and the second end 103 was distal to the plant.
  • the first end 102 may be referred to as the base of the leaf 100
  • the second end 103 may be referred to as the tip of the leaf 100.
  • the leaf 100 has a major surface 104 and a margin 105.
  • the leaf 100 is positioned inside the casing 6 such that the major surface 104 faces the imaging device 2, and the other major surface of the leaf 100 faces, and is in touching contact with, the bottom plate 12.
  • the leaf 100 is here approximately symmetrical around the central line 101, and the discolorations that may appear in leaves due to nutrient deficiencies are typically approximately symmetrical about the central line 101.
  • dis-coloration pattern around the principal axis one could qualitatively and quantitatively (in some cases) estimate the nutrient deficiency.
  • the principles of such analysis are known per se, and will not be discussed in further detail. However, in the following will be described a process according to an embodiment of the present invention, for obtaining useful input data for such an analysis.
  • the imaging device 2 transmits the image 200 to the processing device 14.
  • the image 200 is in this case sent wirelessly from the imaging device 2 to the processing device 14.
  • the processing device 14 receives the image 200 from the imaging device 2. After having received the image 200, the processing device 14 starts analyzing the image 200 of the leaf 100. In this case, the processing device 14 analyzes the image 200 to see whether or not the leaf 100 suffers from nitrogen deficiency. The leaves of a plant that does not receive enough nitrogen turn yellow. The greater the nitrogen deficiency, the more yellow the leaves turn. It is noted that, in a different example, the processing device 14 may check for some other type of nutrient deficiency or for more than one type of nutrient deficiency.
  • the leaves of many plants have a rich green color when healthy. Discolored leaves may indicate that the plant is not receiving enough of one or more nutrients. For example, nitrogen deficiency is typically manifested by the leaf becoming less green and more yellow. Further, reddish-purple marks on the leaf may indicate a phosphor shortage, whitish stripes may indicate a magnesium deficiency, and a drought may cause the leaf to become grayish-green. It is noted that, since some type of diseases and chemicals cause discoloration in leaves, the system 1 may also be used to detect discolorations due to diseases and chemical exposure.
  • the processing device 14 defines at least two lines in the image 200.
  • a first line 201, a second line 202 and a third line 203 are defined.
  • the lines 201, 202, 203 are in this case straight and parallel.
  • Each one of the lines 201, 202, 203 here extends in the width direction of the leaf 100 and joins two points located on the margin 105.
  • the two points denoted joined by the first line 201 are denoted by P 1 and P 2 , respectively in Figure 2 .
  • the point P 1 is located on one side of the central line 101 and that the other point P 2 is located on the other side of the central line 101.
  • the lines 201, 202, 203 here also extends beyond the margin 105 and into the region of the image 200 where the black-and-white pattern 13 is visible.
  • the lines 201, 202, 203 are separated along the central line 101. Using paths 201, 202, 203 that are not too close together may improve the nutrient deficiency estimate as they provide information from a larger part of the leaf.
  • the second line 202 is here located approximately halfway along the central line 101 between the first end 102 and the second end 103.
  • the first line 201 is here located approximately halfway along the central line 101 between the first end 102 and the second line 202.
  • the third line 203 is here located approximately halfway along the central line 101 between the second end 103 and the second line 202.
  • the lines 201, 202, 203 may be defined in a different manner.
  • the lines may cover only the part of the image where the leaf 100 is represented and/or arranged at other positions along the central line 101 than shown in Figure 2 .
  • the lines 201, 202, 203 may be non-parallel.
  • the processing device 14 determines the length of each line 201, 202, 203 in order to determine the age of the leaf 100.
  • the lengths of the lines 201, 202, 203 are denoted by l 1 , l 2 and l 3 , respectively, in Figure 2 . Determining the lengths of the lines 201, 202, 203 allows for the width of the leaf 100 at different positions, and hence its age, to be estimated.
  • the processing device 14 gauges the color of the leaf 100 along each one of the lines 201, 202, 203. Specifically, in this case, gauging the color of the leaf 100 comprises determining the variation of the color yellow along the lines 201, 202, 203. The gauging performed at step S9 may comprise determining how another color than yellow, or how several colors, vary along the lines 201, 202, 203, depending on the nutrient deficiency or deficiencies the user of the system 1 is looking for. Step S9 may be performed using conventional image analysis software.
  • the processing device 14 assesses at least one leaf component along each one of the lines 201 202, 203. For example, the processing device 14 may count the number of veins that cross each path 201, 202, 203 or estimate the amount of chlorophyll along the lines 201, 202, 203. Step S10 may be performed using conventional image analysis software.
  • the processing device 14 estimates a nutrient deficiency of the leaf 100. To this end, the processing device 14 uses the age determined in step S8, the color gauged in step S9, and the leaf component characteristic determined in step S10. In this case, the processing device 14 also uses a machine learning model and a library of discoloration trends when estimating the nutrient deficiency. Specifically, the processing device 14 here estimates whether the leaf 100 show signs of not having received enough nitrogen.
  • the processing device 14 determines a fertilization recommendation for the plant from which the leaf 100 was removed. In this case, if it is determined at step S11 that the leaf 100 has not been getting nitrogen the recommendation may be to give a particular amount of nitrogen, or simply more nitrogen, to the plant.
  • the processing device 14 is in this case configured to send the fertilization recommendation to the imaging device 2.
  • the imaging device 2 displays the received recommendation on the screen 5.
  • step S12 is optional and may be omitted in a different example.
  • the processing device 14 may for example send a result of the step S11, such as whether or not the leaf 100 suffers from a certain nutrient deficiency and/or the degree to which the leaf suffers from such a deficiency, to the imaging device 2, without including a fertilization recommendation.
  • the user may then decide whether or not the plant should be given any type of fertilization, based on the information provided to him or her.
  • steps S7 to S10 may be performed simultaneously or in a different order than described above. Further, it is noted that the steps S1 to S5 may be referred to as a method for acquiring and transmitting an image of the leaf 100 and that the steps S6 to S11 may be referred to as a method of receiving an image of a leaf and estimating a deficiency of a nutrient in the leaf.

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EP19198091.1A 2019-09-18 2019-09-18 Détection de déficience en nutriments dans des plantes Withdrawn EP3794934A1 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP19198091.1A EP3794934A1 (fr) 2019-09-18 2019-09-18 Détection de déficience en nutriments dans des plantes
PCT/EP2020/076025 WO2021053098A1 (fr) 2019-09-18 2020-09-17 Détection de déficience en nutriment dans des plantes
AU2020349600A AU2020349600A1 (en) 2019-09-18 2020-09-17 Detection of nutrient deficiency in plants
CN202080065629.8A CN114391094A (zh) 2019-09-18 2020-09-17 植物中的营养素缺乏的检测
CA3153992A CA3153992A1 (fr) 2019-09-18 2020-09-17 Detection de deficience en nutriment dans des plantes
BR112022003480A BR112022003480A2 (pt) 2019-09-18 2020-09-17 Invólucro para uso em um sistema, sistema para estimar uma deficiência de um nutriente em uma folha, e, método para determinar uma deficiência de um nutriente em uma folha
EP20771330.6A EP4030889B1 (fr) 2019-09-18 2020-09-17 Détection de déficience en nutriments dans des plantes
CONC2022/0004397A CO2022004397A2 (es) 2019-09-18 2022-04-06 Detección de deficiencia de nutrientes en las plantas

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EP19198091.1A EP3794934A1 (fr) 2019-09-18 2019-09-18 Détection de déficience en nutriments dans des plantes

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EP19198091.1A Withdrawn EP3794934A1 (fr) 2019-09-18 2019-09-18 Détection de déficience en nutriments dans des plantes
EP20771330.6A Active EP4030889B1 (fr) 2019-09-18 2020-09-17 Détection de déficience en nutriments dans des plantes

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CN (1) CN114391094A (fr)
AU (1) AU2020349600A1 (fr)
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CA (1) CA3153992A1 (fr)
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US6734973B1 (en) * 2001-02-06 2004-05-11 The Regents Of The University Of California Method and apparatus for determining plant nutrient status
US8724979B2 (en) * 2012-09-27 2014-05-13 Viewpoint Laboratories, LLC. Imaging enclosure apparatus and methods
WO2016106215A1 (fr) * 2014-12-23 2016-06-30 The Regents Of The University Of California Procédé et dispositif permettant une quantification de la teneur en chlorophylle des plantes
WO2018122242A2 (fr) * 2016-12-29 2018-07-05 Yara International Asa Dispositif portatif et procédé de détermination d'un état d'une plante
EP3477271A1 (fr) * 2017-10-26 2019-05-01 Yara International ASA Dispositif portatif utilisant un guide de lumière et son utilisation pour déterminer l'état d'une plante

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AU2002341464A1 (en) * 2002-09-17 2004-04-08 Qp Card Method and arrangement for colour correction of digital images
JP2005250628A (ja) * 2004-03-02 2005-09-15 Mitsubishi Electric Corp カメラキャリブレーションパターン、装置、および方法
JP2009290822A (ja) * 2008-06-02 2009-12-10 Ricoh Co Ltd 画像処理装置、画像処理方法、プログラムおよび記録媒体
US20140242612A1 (en) * 2011-07-14 2014-08-28 Shuqi Wang System and method for integration of mobile device imaging with microchip elisa
FR3028038B1 (fr) * 2014-10-31 2018-01-12 Commissariat A L'energie Atomique Et Aux Energies Alternatives Procede et systeme d'estimation d'une concentration d'une espece dans un milieu de culture par imagerie sans lentille
US10664965B2 (en) * 2016-10-31 2020-05-26 Graftek Imaging Inc. Digital color assessment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6734973B1 (en) * 2001-02-06 2004-05-11 The Regents Of The University Of California Method and apparatus for determining plant nutrient status
US8724979B2 (en) * 2012-09-27 2014-05-13 Viewpoint Laboratories, LLC. Imaging enclosure apparatus and methods
WO2016106215A1 (fr) * 2014-12-23 2016-06-30 The Regents Of The University Of California Procédé et dispositif permettant une quantification de la teneur en chlorophylle des plantes
WO2018122242A2 (fr) * 2016-12-29 2018-07-05 Yara International Asa Dispositif portatif et procédé de détermination d'un état d'une plante
EP3477271A1 (fr) * 2017-10-26 2019-05-01 Yara International ASA Dispositif portatif utilisant un guide de lumière et son utilisation pour déterminer l'état d'une plante

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CO2022004397A2 (es) 2022-06-21
WO2021053098A1 (fr) 2021-03-25
CA3153992A1 (fr) 2021-03-25
AU2020349600A1 (en) 2022-03-10
EP4030889B1 (fr) 2023-11-29
CN114391094A (zh) 2022-04-22
BR112022003480A2 (pt) 2022-05-24
EP4030889A1 (fr) 2022-07-27

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